Filed Pursuant to Rule 497(e)
                                                  Registration File No.: 2-82510


                                                                   June 30, 2004
                                                                      Supplement

[MORGAN STANLEY LOGO OMITTED]





              SUPPLEMENT DATED JUNE 30, 2004 TO THE PROSPECTUS OF
             MORGAN STANLEY VARIABLE INVESTMENT SERIES -- CLASS X
                               Dated May 1, 2004


The seventeenth paragraph of the section of the Prospectus titled "PORTFOLIO
MANAGEMENT" is hereby replaced by the following:


   Aggressive Equity Portfolio -- The Portfolio is managed within the U.S.
   Growth team. Current members of the team include Dennis Lynch, a Managing
   Director of the Investment Manager, David Cohen, an Executive Director of
   the Investment Manager, and Sam Chainani, a Vice President of the
   Investment Manager.




              PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.